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System and method to control engine during de-sulphurization operation in a hybrid vehicle

a hybrid vehicle and engine control technology, applied in the field of engines, can solve the problems disadvantage of such an approach, degrading the performance of a catalytic converter, etc., and achieve the effects of reducing fuel economy, different levels of combustion torque, and increasing balan

Inactive Publication Date: 2007-04-05
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004] The inventors herein have recognized a disadvantage with such an approach. For example, the engine cylinders with different air-fuel ratios may produce different levels of combustion torque. While adjustment of spark retard may be used to reduce this effect, such operation can reduce fuel economy. Alternatively, the cylinders can be operated with different amounts of airflow, however this may require special engine hardware, such as differential valve timing or lift control.
[0005] One system to address torque imbalances between cylinders (such as from decontamination operation or other differential torque operation) includes a engine with a first cylinder and a second cylinder operating with different engine torques; a motor coupled to said engine capable of absorbing torque and providing torque; and a controller for varying torque of said motor to compensate for said torque difference so that a total engine and motor torque operates with increased balance.
[0006] In this way, it is possible to compensate for torque differences between cylinders without requiring spark retard (although spark may be used in some cases, if desired). Further, torque balance may be achieved even when the cylinders having a torque imbalance have a common valve timing or lift.

Problems solved by technology

However, performance of a catalytic converter may degraded over time for various reasons, including contamination of various materials occupying catalytic sites needed for reducing exhaust emissions.
The inventors herein have recognized a disadvantage with such an approach.
While adjustment of spark retard may be used to reduce this effect, such operation can reduce fuel economy.

Method used

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  • System and method to control engine during de-sulphurization operation in a hybrid vehicle
  • System and method to control engine during de-sulphurization operation in a hybrid vehicle
  • System and method to control engine during de-sulphurization operation in a hybrid vehicle

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Embodiment Construction

[0013] The present disclosure relates to electric vehicles and, more particularly, hybrid electric vehicles (HEVs). FIG. 1 demonstrates just one possible configuration, specifically a parallel / series hybrid electric vehicle (split) configuration.

[0014] In an HEV, a planetary gear set 20 mechanically couples a carrier gear 22 to an engine 24 via a one way clutch 26. The planetary gear set 20 also mechanically couples a sun gear 28 to a generator motor 30 and a ring (output) gear 32. The generator motor 30 also mechanically links to a generator brake 34 and is electrically linked to a battery 36. A traction motor 38 is mechanically coupled to the ring gear 32 of the planetary gear set 20 via a second gear set 40 and is electrically linked to the battery 36. The ring gear 32 of the planetary gear set 20 and the traction motor 38 are mechanically coupled to drive wheels 42 via an output shaft 44.

[0015] The planetary gear set 20, splits the engine 24 output energy into a series path fr...

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PUM

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Abstract

A vehicle system, comprising of an engine with a first cylinder and a second cylinder operating with different engine torques, a motor coupled to said engine capable of absorbing torque and providing torque, and a controller for varying torque of said motor to compensate for said torque difference so that a total engine and motor torque operates with increased balance.

Description

FIELD [0001] The present application relates to engines with cylinders producing different torque levels, where the engine is coupled in a hybrid powertrain of a vehicle. BACKGROUND AND SUMMARY [0002] Engines can use various types of devices to treat emissions in combustion exhaust gasses, one example of which may be referred to as a catalytic converter. However, performance of a catalytic converter may degraded over time for various reasons, including contamination of various materials occupying catalytic sites needed for reducing exhaust emissions. [0003] One approach to remove contamination of an emission control devices includes operating the device at an elevated temperature and controlling an air-fuel ratio of exhaust gasses in the device. In one example, the air-fuel ratio may be rich, and in another example, the air-fuel ratio may be modulated about stoichiometry. Also, one approach to increase the temperature of the device includes operating some cylinders with a lean air-f...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06G7/70B60K1/02F02B75/06
CPCB60K6/445Y10T477/23B60L2240/445B60W10/06B60W10/08B60W10/26B60W20/00B60W2510/068F02D37/02F02D41/0082F02D41/0085F02D41/028Y02T10/54Y02T10/6243Y02T10/6286Y02T10/6239B60K6/448Y02T10/40Y02T10/62B60W20/10
Inventor PALLETT, TOBIASSURNILLA, GOPICHANDRA
Owner FORD GLOBAL TECH LLC
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